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Database Keys MCQs: Questions and Answers PDF Download
A set of one or more attributes that collectively, allow us to identify uniquely a tuple in the relation, is known as
- Unique key
- Special key
- Super key
- Primary key
No two tuples in a relation are allowed to have exactly the same value for
- Some attributes
- All attributes
- Some tuple
- All tuples
Specifying tuples within a given relation, are expressed in terms of the
- Attributes
- Variables
- Function
- Domain
A superkey may contain extraneous
- Attributes
- Keys
- Instances
- Entries
The values of the attribute values of a tuple must be such that they can uniquely identify the
- Instance
- Entity
- Relation
- Tuple
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Database Keys MCQs Book Questions
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